To compile this list, we looked at infielders and outfielders who have played roughly two-thirds of their team’s games at a position (850 innings). We used UZR/150, an advanced defensive metric which measures a player’s total defensive value using factors like range, the amount of runs he prevents with his arm (for outfielders), propensity for turning double plays (for infielders) and whether he commits more or fewer errors than an average defender at his position. The 150 is scaling the numbers to reflect a 150-game sample, which allows for comparisons between players with different numbers of games.

For catchers who have played at least 650 innings, we used Defensive Runs Saved (DRS), a cumulative stat that isn’t thorough by any means but is a decent indicator for this difficult-to-measure position. We’ve used DRS for pitchers, too.

One thing to keep in mind: While defensive statistics have come a long, long way over the past 20 years, they’re still not nearly as definitive as the absolutes provided by offensive and pitching statistics. It’s best to look at multiple years of a player’s data before drawing any final conclusions. (All numbers through Monday’s games.)

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1B: Prince Fielder, Tigers

UZR/150: minus-4.8

As with most players on this list, Fielder makes his living as an exceptional hitter, so a few defensive missteps are excusable. In his eight seasons as a full-time first baseman, Fielder has had a positive UZR/150 twice—he was at 0.2 in 2009 with the Brewers and 0.2 in 2012, his first with the Tigers. His minus-4.8 this year is, in fact, his third-best showing.

Kipnis’ inclusion might be a bit of a surprise, but this position is an example of the inexact science of defensive metrics. By UZR/150, Kipnis is slightly worse than Atlanta’s Dan Uggla (minus-4.8), but by Defensive Runs Saved, it’s not even close. Uggla is at minus-17, while Kipnis is at 2 (as in, a positive number) in a similar number of innings.

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SS: Asdrubal Cabrera, Indians

UZR/150: minus-18.7

Apparently this metric just doesn’t favor Cleveland’s middle-infield combo, though Cabrera’s presence here isn’t nearly as surprising as Kipnis’. Cabrera’s career UZR/150 is minus-10.7, and he’ll finish this season with a negative DRS for the third time in the past four years.

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3B: David Freese, Cardinals

UZR/150: minus-24.9

The competition for this spot was fierce. Four players have an UZR/150 of minus-17.0 or worse—Freese, Michael Young (minus-17.0), Ryan Zimmermann (minus-19.8) and Miguel Cabrera (minus-22.3). For Freese, who was at 4.7 in 2011 and 2.2 last year, his defensive production is just part of an overall disappointing season—the career .296 hitter is at .265 and he’s losing time at third base.

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LF: Domonic Brown, Phillies

UZR/150: minus-10.9

Putting Brown in this spot probably is unfair; only nine players have played at least 850 innings in left field. If we cut the qualifying number to 650 innings, J.B. Shuck (minus-11.3), Justin Upton (minus-12.2) and Raul Ibanez (minus-21.3) jump ahead of Brown, who has been one of the few bright spots (27 home runs) for the Phillies this year.

Before taking over center field for the Reds this season, Choo had played a whopping 83 of his 5,647 career innings at the position. The numbers show the transition hasn’t always been a smooth one. Maybe that’s not surprising; he had a minus-15.8 UZR/150 as a right fielder for the Indians last season.

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RF Michael Cuddyer, Rockies

UZR/150: minus-20.7

Cuddyer has had a great season at the plate—he’s second in the NL with a .328 batting average and had a 27-game hitting streak in the middle of the season—but he’s not exactly an elite defensive right fielder. He’s barely ahead of Carlos Beltran, who has an UZR/150 of minus-20.0 for the Cardinals.

This is where the cumulative nature of DRS comes into play. Both Santana and Wieters have a DRS of minus-12, but Santana has compiled that mark in just 696 2/3 innings, while Wieters has played more innings than any catcher in baseball, at 1,068 2/3. Santana has allowed 44 wild pitches, which ranks as third-worst in baseball behind Salvador Perez (who has played 37 more games at catcher) and Wilin Rosario (19 more games).

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SP: Tim Lincecum, Giants

DRS: minus-8

This shouldn’t be a surprise. Lincecum’s violent delivery doesn’t leave him in ideal fielding position after he throws the baseball toward the plate. He has had a negative DRS in six of his seven seasons, with a 0 DRS in 2011 as the lone exception.

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RP: J.C. Gutierrez, Angels

DRS: minus-6

Gutierrez had a negative DRS each of his previous four big-league seasons, but this is special. DRS is a cumulative statistic, but he’s tied for fourth with all pitchers—starters included—in only 47 1/3 innings.